Tip revelation (quite a wow!)
Getting recently few sets of tips, I started to explore them.
Penon Liquier Orange claimed to enhance bass. I am not much of a basshead, but one IEM that has the bass totally anemic to my experience was Truthear Hexa, while the rest of the range and resolution was quite nice (but no decent bass support - no good IEM, I learned).
My "go to" tips are TRI Clarion (seems to fit well my ear anatomy, and I strongly prefer wide bore tips not to striangulate the sound), they did not work with Hexa. Moondrop Spring were a bit better, but still "not it".
XL orange liqueur tips delivered better results, much more listenable Hexa.
A total surprise came when I put L orange tips that I got in my package (I always thought of my ears being large and served better with XL tips, but with all tips combinations available - I got L, XL, XL just in case) - and, wow, I finally got a usable enjoyable IEM (still a lean monitor one, but nice to my limited tastes - The Grosse Fuge rendered by Takacs Quartet is on a lean and austere side but great at that!) Wow!
Kudos to Penon (to which I am not affiliated by any means, but should acknowledge their great tips that made a real difference).